add new variables for "pagination" to improve support of customizing

Drop remaining leading commas

Update grunt-csscomb dependency

Per David DM.

* Deprecate .pull-right class for .blockquote-reverse
* Move font-size change to the parent, blockquote, instead of setting on the p element to allow more flexible content

Fix sentence grammar

'as well' was used twice in sentence

Write Glyphicons to _data, generate Glyphicons markup

No leading pluses

2 instead of 4 spaces in .csscomb.json

Update css.html

Documentation (missing word)

Deleted curly brackets (in css.html)

Docu: typo fix: replaced 'model-open' with 'modal-open'

omit versions in Sauce browser config; no explicit version implies latest

Added position: static to table th and td when using grid classes for sizing

This generates a glyphicons.yml file from the glyphicons.less source,
and then components.html uses that data to generate the Glyphicons docs
by iterating through the data. The _data directory was introduced in
Jekyll 1.3.0, and GitHub Pages is already on [version 1.4.2][1].

Fixes #11862.

[1] https://github.com/github/pages-gem/blob/master/github-pages.gemspec#L16

mention core team maintenance & community contributors

Tested the customizer, the generated zip had:
    css/bootstrap.css:line 6: * Licensed under MIT (<%= _.pluck(pkg.licenses, "url").join(", ") %>)
Revised customizer generates:
    css/bootstrap.css:line 4: * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)